Protection device of digital holographic pulverized coal fineness online measurement light window

The utility model discloses a protection device of a digital holographic pulverized coal fineness on-line measurement light window. The protection device comprises a measurement cavity, an optical window and a gas channel, two coaxial and symmetrical optical windows are formed in the waist part of the measuring cavity; two coaxial and symmetrical gas channels are formed in the upper portion of themeasuring cavity, and compressed gas enters the measuring cavity through the gas channels to form a gas curtain with the same flowing direction as measured pulverized coal in the measuring cavity. The protection device of the digital holographic pulverized coal fineness on-line measurement light window can prevent pulverized coal particles in the measurement cavity from contaminating the opticalwindow. 本实用新型公开了一种数字全息煤粉细度在线测量光窗的保护装置，所述保护装置包括：测量腔、光学视窗、气体通道；所述测量腔的腰部开有两个同轴、对称的光学视窗；所述测量腔的上部设有两个同轴、对称的气体通道，压缩气体经气体通道进入测量腔形成与测量腔中被测煤粉流动方向相同的气幕。本实用新型提供的数字全息煤粉细度在线测量光窗的保护装置可以防止测量腔中的煤粉颗粒沾污到光学视窗上。